1999 Audi A6 Speaker Sizes and Audio System Guide
1999 Audi A6 Speaker Sizes and Audio System Guide
This page covers the factory speaker layout for the 1999 Audi A6 C5, along with the key details you need before planning an upgrade. Equipment can vary by trim, body style, and audio package, so the exact setup may differ between vehicles. Use the speaker locations and notes here to confirm what your car has before choosing replacement speakers or planning any audio changes.
Data verified by Nick Marchenko, PhD
Speaker Size Chart – 1999 Audi A6
Use this table as the main reference. Fitment depends on trim, factory audio package, mounting depth, and adapter availability.
| Location | Type | Factory Size | Note |
|---|---|---|---|
| Rear Deck Corner | Full-Range | 6.5 inch | |
| Front Door | Tweeter | 1 inch | if equipped |
| Front Door | Full-Range | 6.5 inch | |
| Rear Door | Tweeter | 1 inch | if equipped |
| Rear | Mid-Bass | 6 inch | if equipped |
Generic speaker location diagram. The table above shows the specific factory sizes for this vehicle. Exact location details may vary by body style and trim.
Recommended Speakers for the 1999 Audi A6
Selected aftermarket speakers that match the factory sizes for this vehicle. Always verify mounting depth, connector type, and audio package before ordering.
6.5" Speakers
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Speaker Count by Trim – 1999 Audi A6
Speaker count and audio equipment vary by trim and factory audio package. This table lists known configurations from our database.
| Trim | Speakers | Amplifier | Radio | Navigation |
|---|---|---|---|---|
| 2.8 Avant 4dr Station Wagon | 8 | std | – | – |
| Base 4dr Sedan | 8 | std | – | – |
Data sourced from manufacturer specifications. Verify with the window sticker or dealer before ordering audio components.
Vehicle and Audio System Specifications
This block helps identify the vehicle and its audio system configuration for fitment decisions.
Sedan vs Wagon – Audio Differences
Different body styles of this model may vary in rear speaker placement and factory audio packages, so equipment should be verified by vehicle configuration. The listed speaker layout is based on direct data for this year, and factory amplifier details should be checked by trim and audio package. Tweeters and rear mid-bass speakers may be included if equipped.
What Speakers Fit the 1999 Audi A6?
Aftermarket fitment should start with the factory speaker locations listed above, but diameter alone is not enough. Check mounting depth, bracket fit, connector type, and whether the vehicle has a premium or factory-amplified audio system. This 1999 Audi A6 uses 6.5-inch full-range speakers in the front doors and rear deck corner, while tweeters are listed as optional in the front and rear doors. A 6-inch rear mid-bass location is also listed if equipped, so verify the exact audio package before ordering.
Usually Safe Upgrades
- If your vehicle uses the front door full-range location, a 6.5-inch aftermarket speaker is the closest factory-size match.
- If your vehicle uses the rear deck corner full-range location, a 6.5-inch speaker is the size to compare first.
- If your vehicle has the front door tweeter location, a 1-inch tweeter may be present if equipped.
- If your vehicle has the rear door tweeter location, a 1-inch tweeter may be present if equipped.
- If your vehicle uses the rear mid-bass location, a 6-inch speaker should be matched to that opening only if equipped.
Check Before Buying
- Confirm the exact speaker location before ordering, since tweeters and the rear mid-bass position are optional equipment.
- Measure mounting depth and check the factory opening, because size alone does not guarantee a proper match.
- Verify connector style and any adapter needs before purchase.
- Factory amplifier details should be verified by trim and audio package.
- Use the trim and audio package to confirm whether your car matches the listed 8-speaker setups.
Installation Notes
The 1999 Audi A6 C5 uses an 8-speaker layout on the trims listed, and speaker equipment can vary by audio package. Front door 6.5-inch speakers are listed, with 1-inch tweeters if equipped, and rear door tweeters may also be present depending on the system. Rear deck corner 6.5-inch full-range speakers are also listed, and some setups may include a 6-inch rear mid-bass speaker if equipped. Before starting, remove the door and rear panels carefully so clips and trim pieces are not damaged. Check speaker depth and mounting space before ordering new speakers, since factory locations can be tight. A mounting adapter may be needed to secure aftermarket speakers properly, and a harness adapter is recommended to avoid cutting factory wiring. If your vehicle has the factory subwoofer, confirm its location and wiring before planning the upgrade. Test each speaker after installation to verify polarity, balance, and full system operation.
Moderate difficulty, since panel removal, wiring checks, and fitment verification all matter on this vehicle.
Common Mistakes When Replacing Speakers
Common speaker upgrade mistakes on the 1999 Audi A6 usually come from assuming every car in the lineup is the same instead of verifying the actual audio setup on the vehicle.
- Buying based only on the body-style label instead of checking actual speaker locations on the vehicle.
- Skipping trim and audio package verification, even though speaker count and factory amplifier details can vary by trim.
- Assuming the front door tweeters are present on every car instead of confirming whether they are equipped.
- Ignoring mounting depth and speaker size checks at each location, which can cause fitment problems during installation.
- Overlooking connector style and wiring compatibility before ordering parts, which can lead to extra adapter work.
- Reassembling the door or interior panels before testing the new speakers, wiring, and balance settings first.
Generation & Model Family
The 1999 Audi A6 belongs to the C5 (Second generation) (1999–2001) family. Nearby model years often share similar speaker locations and audio layouts, but exact fitment can vary by trim and audio package – verify before ordering.
Recommended Upgrade Path
The 1999 Audi A6 offers an 8-speaker setup on the trims listed here, and equipment can vary by trim and audio package. Front-stage upgrades are usually the best starting point for buyers who want cleaner sound, while bass and volume goals may call for additional system changes. Factory amplifier details should be verified before planning larger upgrades.
| Goal | Best Upgrade Path | Why |
|---|---|---|
| Better clarity | Upgrade the front door speakers first and, if equipped, replace the front tweeters with higher-quality components that better match the factory system. | Cleaner front-stage speakers improve vocals, detail, and stereo imaging, and the tweeters help refine the highs when the vehicle is equipped with them. |
| More bass | Add an aftermarket subwoofer system to complement the factory speakers and set it up so the low end fills in without overpowering the rest of the system. | The listed factory speaker layout does not include a factory subwoofer, so a dedicated sub is the most effective way to add deeper bass. |
| Louder sound | Properly matched speakers and amplifier integration can improve volume and reduce distortion. Verify factory amp or premium system integration before adding aftermarket amplifiers. | Higher output works best when the speakers and amplification are matched correctly, and checking the factory audio setup first helps avoid integration issues. |
| Budget improvement | Replace the front door speakers first with same-size replacement speakers with correct mounting brackets. | The front doors handle the most important part of the listening experience, so this gives the biggest improvement for the money before moving to the rest of the system. |
| Factory look | Use same-size replacement speakers with the correct mounting brackets and harness adapters for a clean install that preserves the factory wiring and appearance. | This approach keeps the cabin looking original while still improving sound, and it helps maintain the factory fit and wiring layout. |
Mounting Adapters and Wiring
The same nominal diameter does not guarantee a direct mount. Before ordering, confirm:
- Speaker depth: Aftermarket speakers often have larger magnets – measure available depth at each location.
- Mounting brackets: Door locations typically need a bracket or spacer to clear the window regulator and achieve correct mounting depth.
- Wiring harness adapters: Use a plug-and-play harness adapter to preserve factory wiring.
- Tweeter mounting cups: Replacing OEM tweeters may require surface-mount cups or brackets depending on the location.
- Factory or premium amplified systems: If the vehicle has a premium or factory-amplified audio system, confirm how the factory radio, amplifier, and speakers are connected before adding aftermarket amplifiers. Depending on the setup, a line output converter, DSP, integration harness, or professional installation may be needed.
- Connector type: Factory connectors vary by trim and model year – confirm compatibility before splicing or using an adapter.
Frequently Asked Questions
What size are the front door speakers in the 1999 Audi A6?
The front door full-range speakers are 6.5 inches. Front door tweeters are 1 inch if equipped.
What size are the rear speakers in the 1999 Audi A6?
Rear deck corner speakers are 6.5-inch full-range units. Rear door tweeters are 1 inch if equipped, and rear mid-bass speakers are 6 inches if equipped.
Does the 1999 Audi A6 have a factory subwoofer?
A factory subwoofer is not listed for this model year. If your vehicle has one, it would depend on the audio package or trim.
Do I need mounting adapters for speaker replacement?
Mounting adapter needs can vary by speaker location and the replacement speaker you choose. Check the vehicle’s speaker size and mounting depth before ordering parts.
Can I replace the speakers without replacing the radio?
Yes, speaker replacement can be done while keeping the factory radio. Factory amplifier details should be verified by trim and audio package before choosing speakers.
Does the 1999 Audi A6 have a factory amplifier?
Factory amplifier details should be verified by trim and audio package. The available data shows it is present on some trims, but it is not universal.